Actuator-Device Coordination in a Reliable Sensor, Actuator, and Device Network (SADN)

A sensor, actuator, and device network (SADN) is composed of sensor, actuator, and device nodes. Sensor nodes sense physical events and send sensed values of the events to actuator nodes. Actuator nodes decide on proper actions on receipt of sensed values and then issue requests of the actions to the device nodes. We propose an SADN model where sensor, actuator, and device functions are replicated in multiple nodes and each of sensor-actuator and actuator-device communication is realized in a communication protocol. A device node supports types of actions. For example, some action cannot be compensated by another action. An action has to be performed on only one device node. We classify actions into some types. For each type of action, we have to discuss a protocol for reliably performing the action on an device node in the presence of nodes and network faults. In this paper, we discuss how to perform actions on device nodes depending on types of the actions so that each action is surely performed on the required number of device nodes.